Android自定义View实现QQ消息气泡
作者:z真真
这篇文章主要为大家详细介绍了Android自定义View实现QQ消息气泡,文中示例代码介绍的非常详细,具有一定的参考价值,感兴趣的小伙伴们可以参考一下
本文实例为大家分享了Android自定义View实现QQ消息气泡的具体代码,供大家参考,具体内容如下
效果图:
原理:
控件源码:
public class DragView extends View { private int defaultZoomSize = 8; //初始化圆的大小 private int initRadius; //圆1的圆心位置 private PointF center1; private PointF center2; private PointF point1; private PointF point2; private PointF point3; private PointF point4; private int mWidth; private int mHeight; private float realZoomSize; private float currentRadius; private float minRadiusScale = 1 / 2f; private Paint paint; private Path path; private Bitmap bitmap; @DragStatus private int mDragStatus; public DragView(Context context) { this(context, null); } public DragView(Context context, @Nullable AttributeSet attrs) { this(context, attrs, 0); } public DragView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); paint = new Paint(); paint.setColor(Color.BLUE); paint.setStyle(Paint.Style.FILL); paint.setStrokeWidth(4); paint.setAntiAlias(true); path = new Path(); center1 = new PointF(); center2 = new PointF(); point1 = new PointF(); point2 = new PointF(); point3 = new PointF(); point4 = new PointF(); bitmap = BitmapFactory.decodeResource(context.getResources(), R.mipmap.icon_pot); initRadius = Math.min(bitmap.getWidth(), bitmap.getHeight()) / 2; Log.e("zhen", "解析bitmap: " + bitmap.getWidth() + " * " + bitmap.getHeight() + " * " + initRadius); } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); mWidth = w; mHeight = h; center1.set(mWidth / 2, mHeight / 2); Log.d("zhen", "圆心位置:x" + center1.x + " y: " + center1.y); } private boolean isSelected = false; @Override public boolean onTouchEvent(MotionEvent event) { float x = event.getX(); float y = event.getY(); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: if (Math.sqrt(Math.pow(x - center1.x, 2) + Math.pow(y - center1.y, 2)) < initRadius && mDragStatus == DragStatus.NORMAL) { inAnimation = false; isSelected = true; Log.e("zhen", "选中状态"); } break; case MotionEvent.ACTION_MOVE: if (isSelected) { // Log.d("zhen", "拖动距离: " + dragDistance); if (mDragStatus != DragStatus.DRAG_BACK && mDragStatus != DragStatus.DRAG_TO) { mDragStatus = DragStatus.DRAG_MOVE; center2.set(x, y); float dragDistance = (float) (Math.sqrt(Math.pow(center2.x - center1.x, 2) + Math.pow(center2.y - center1.y, 2))); //多少倍圆的大小 realZoomSize = dragDistance / initRadius; invalidate(); } } break; case MotionEvent.ACTION_UP: if (isSelected) { if (realZoomSize <= defaultZoomSize) { //回弹,改变center2.x, center2.y直到等于center1.x, center1.y doAnimation(DragStatus.DRAG_BACK, center2, center1); } } isSelected = false; break; } return true; } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); //圆的半径改变 currentRadius = initRadius * (1 + (minRadiusScale - 1) / defaultZoomSize * realZoomSize); if (realZoomSize > defaultZoomSize) { //圆缩小为一半,去往目的地,就应该消失了 doAnimation(DragStatus.DRAG_TO, center1, center2); } //中间矩形 // paint.setColor(Color.BLACK); float angle = (float) Math.atan((center2.y - center1.y) / (center2.x - center1.x)); float sinValue; float cosValue; float controlX; float controlY; sinValue = (float) Math.abs((currentRadius * Math.sin(angle))); cosValue = (float) Math.abs((currentRadius * Math.cos(angle))); controlX = (center1.x + center2.x) / 2; controlY = (center1.y + center2.y) / 2; point1.set(center1.x - sinValue, center1.y - cosValue); point2.set(center1.x + sinValue, center1.y + cosValue); point3.set(center2.x - sinValue, center2.y - cosValue); point4.set(center2.x + sinValue, center2.y + cosValue); path.reset(); switch (mDragStatus) { case DragStatus.NORMAL: currentRadius = initRadius; //原始图片 canvas.drawBitmap(bitmap, center1.x - initRadius, center1.y - initRadius, paint); //起始位置的圆 // paint.setColor(Color.RED); // canvas.drawCircle(center1.x, center1.y, currentRadius, paint); break; case DragStatus.DRAG_MOVE: //拖动过程中 path.moveTo(point1.x, point1.y); path.lineTo(point2.x, point2.y); path.quadTo(controlX, controlY, point4.x, point4.y); path.lineTo(point3.x, point3.y); path.quadTo(controlX, controlY, point1.x, point1.y); canvas.drawPath(path, paint); //起始位置的圆 paint.setColor(Color.RED); canvas.drawCircle(center1.x, center1.y, currentRadius, paint); //结束位置的圆 // paint.setColor(Color.BLUE); // canvas.drawCircle(center2.x, center2.y, currentRadius, paint); //原始图片 canvas.drawBitmap(bitmap, center2.x - initRadius, center2.y - initRadius, paint); break; case DragStatus.DRAG_BACK: //改变center2.x, center2.y直到等于center1.x, center1.y path.reset(); path.moveTo(point1.x, point1.y); path.quadTo(center2.x, center2.y, point2.x, point2.y); canvas.drawPath(path, paint); //起始位置的圆 // paint.setColor(Color.RED); // canvas.drawCircle(center1.x, center1.y, currentRadius, paint); //原始图片 canvas.drawBitmap(bitmap, center1.x - initRadius, center1.y - initRadius, paint); break; case DragStatus.DRAG_TO: //改变center1.x, center1.y,直到等于center2.x, center2.y path.reset(); path.moveTo(point3.x, point3.y); path.quadTo(center1.x, center1.y, point4.x, point4.y); canvas.drawPath(path, paint); // //起始位置的圆 // paint.setColor(Color.RED); // canvas.drawCircle(center1.x, center1.y, currentRadius, paint); // //结束位置的圆 // paint.setColor(Color.BLUE); // canvas.drawCircle(center2.x, center2.y, currentRadius, paint); //原始图片 canvas.drawBitmap(bitmap, center2.x - initRadius, center2.y - initRadius, paint); break; } // Log.d("zhen", "dragStatus: " + mDragStatus + " 圆1:" + center1 + " 圆2:" + center2 + " 半径: " + currentRadius); // Log.w("zhen", "dragStatus: " + mDragStatus + " point3:" + point3 + " point4" + point4 + " sinValue " + sinValue + " cosValue " + cosValue); Log.w("zhen", "dragStatus: " + mDragStatus + " 圆1:" + center1 + " 圆2:" + center2 + " 半径: " + currentRadius); } int i = 0; private boolean inAnimation = false; private void doAnimation(int dragStatus, final PointF startPoint, final PointF endPoint) { if (inAnimation) return; inAnimation = true; final int step = 10; final float stepx = (endPoint.x - startPoint.x) / step; final float stepy = (endPoint.y - startPoint.y) / step; i = 1; mDragStatus = dragStatus; Log.d("zhen", "dragStatus: " + mDragStatus + " startPoint:" + startPoint + " endPoint:" + endPoint + " stepx: " + stepy + " stepx: " + stepy); new Thread(new Runnable() { @Override public void run() { while (i <= step) { startPoint.x += stepx; startPoint.y += stepy; postInvalidate(); i++; try { Thread.sleep(50); } catch (InterruptedException e) { e.printStackTrace(); } } mDragStatus = DragStatus.NORMAL; invalidate(); Log.e("zhen", "恢复为可拖动状态"); } }).start(); } @IntDef({DragStatus.DRAG_MOVE, DragStatus.DRAG_TO, DragStatus.DRAG_BACK}) public @interface DragStatus { int NORMAL = 0; //拖动中 int DRAG_MOVE = 1; // int DRAG_TO = 2; //回弹 int DRAG_BACK = 3; } }
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。